The barrier to entry that sustains a natural monopoly is

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Natural monopolies exist when one firm can produce at a lower cost than any potential competitor due to large economies of scale. This creates a barrier to entry for other firms, as they cannot match the lower costs of the incumbent firm without similarly large scale production. Therefore, economies of scale sustain natural monopolies. The other choices are not necessarily associated with natural monopolies - implicit price fixing is illegal, government regulation can break up monopolies, and patent protection only lasts for a limited time.

The Barrier to Entry That Sustains a Natural Monopoly Is